/* Copyright (C) 2000 MySQL AB

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

/* This file should be included when using merge_isam_funktions */

#ifndef _myisammrg_h
#define _myisammrg_h
#ifdef __cplusplus
extern "C"
{
#endif

#ifndef _my_base_h
#include <my_base.h>
#endif
#ifndef _myisam_h
#include <myisam.h>
#endif

#include <queues.h>

#define MYRG_NAME_EXT ".MRG"

/* In which table to INSERT rows */
#define MERGE_INSERT_DISABLED 0
#define MERGE_INSERT_TO_FIRST 1
#define MERGE_INSERT_TO_LAST 2

  extern TYPELIB merge_insert_method;

  /* Param to/from myrg_info */

  typedef struct st_mymerge_info /* Struct from h_info */
  {
    ulonglong records; /* Records in database */
    ulonglong deleted; /* Deleted records in database */
    ulonglong recpos;  /* Pos for last used record */
    ulonglong data_file_length;
    uint reclength;     /* Recordlength */
    int errkey;         /* With key was dupplicated on err */
    uint options;       /* HA_OPTION_... used */
    ulong *rec_per_key; /* for sql optimizing */
  } MYMERGE_INFO;

  typedef struct st_myrg_table_info
  {
    struct st_myisam_info *table;
    ulonglong file_offset;
  } MYRG_TABLE;

  typedef struct st_myrg_info
  {
    MYRG_TABLE *open_tables, *current_table, *end_table, *last_used_table;
    ulonglong records; /* records in tables */
    ulonglong del;     /* Removed records */
    ulonglong data_file_length;
    ulong cache_size;
    uint merge_insert_method;
    uint tables, options, reclength, keys;
    my_bool cache_in_use;
    LIST open_list;
    QUEUE by_key;
    ulong *rec_per_key_part; /* for sql optimizing */
  } MYRG_INFO;

  /* Prototypes for merge-functions */

  extern int myrg_close(MYRG_INFO *file);
  extern int myrg_delete(MYRG_INFO *file, const byte *buff);
  extern MYRG_INFO *myrg_open(const char *name, int mode, int wait_if_locked);
  extern int myrg_panic(enum ha_panic_function function);
  extern int myrg_rfirst(MYRG_INFO *file, byte *buf, int inx);
  extern int myrg_rlast(MYRG_INFO *file, byte *buf, int inx);
  extern int myrg_rnext(MYRG_INFO *file, byte *buf, int inx);
  extern int myrg_rprev(MYRG_INFO *file, byte *buf, int inx);
  extern int myrg_rnext_same(MYRG_INFO *file, byte *buf);
  extern int myrg_rkey(MYRG_INFO *file, byte *buf, int inx, const byte *key, uint key_len,
                       enum ha_rkey_function search_flag);
  extern int myrg_rrnd(MYRG_INFO *file, byte *buf, ulonglong pos);
  extern int myrg_rsame(MYRG_INFO *file, byte *record, int inx);
  extern int myrg_update(MYRG_INFO *file, const byte *old, byte *new_rec);
  extern int myrg_write(MYRG_INFO *info, byte *rec);
  extern int myrg_status(MYRG_INFO *file, MYMERGE_INFO *x, int flag);
  extern int myrg_lock_database(MYRG_INFO *file, int lock_type);
  extern int myrg_create(const char *name, const char **table_names, uint insert_method, my_bool fix_names);
  extern int myrg_extra(MYRG_INFO *file, enum ha_extra_function function, void *extra_arg);
  extern void myrg_extrafunc(MYRG_INFO *info, invalidator_by_filename inv);
  extern ha_rows myrg_records_in_range(MYRG_INFO *info, int inx, key_range *min_key, key_range *max_key);

  extern ulonglong myrg_position(MYRG_INFO *info);
#ifdef __cplusplus
}
#endif
#endif
